Utility knife



FIG. 1 is a perspective view of a utility knife, portions shown in broken lines showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left end view thereof; and,

FIG. 7 is a right end view thereof.

No claim is made to the blade portion illustrated in broken lines. 

CLAIM The ornamental design for a utility knife, as shown and described. 